I remember playing this game in the 90s as a kid and loving it. Now that I'm in my 30s, the game is still as fun as ever. It has multiple difficulties and if you want a challenge, the highest one will definitely deliver. It is a simple but very fun game and I definitely recommend it.
You have to arrange railroads by drawing lines between different shapes. Over time, more and more "people" want to take the train, and basically you transport as many as you can until the network is overwhelmed. When you want to unwind, this is the game to play. Simple, relaxing and entertaining.